Looks like it could be a sony battery! In that case you're good. But it's hard to judge by that picture.
Also sub ohm on 18350 battery (efest one) is a big no, since they're only made to handle 10 amps.
Edit:
You might want to invest into a better charger aswell, trustfire have a bad reputation of overcharging the batteries. But since you've an multimeter just check the batteries after every charge. And if it's consistent on 4.2v charge, keep on using it.
Else nitecore or xtar are great chargers.
